Seguenzia stephanica Dall, 1908,

Geiger, Daniel L., 2019, The Family Seguenziidae Verrill, 1884 in the Northeast Pacific, including a comment on excessive numbers of taxonomic data portals, Zoosymposia 13, pp. 61-69: 66

publication ID

http://dx.doi.org/10.11646/zoosymposia.13.1.7

publication LSID

lsid:zoobank.org:pub:urn:lsid:zoobank.org:pub:16D27C71-5A6C-4ADF-AD6C-6B07C2773112

persistent identifier

http://treatment.plazi.org/id/D557D228-F43E-FFBC-D58F-FCE8FC44F830

treatment provided by

Plazi

scientific name

Seguenzia stephanica Dall, 1908
status

 

Seguenzia stephanica Dall, 1908 

( Figure 2View FIGURE 2 G–H)

Seguenzia stephanica Dall, 1908: 325  . Holotype USNM 123034. Ventana Bay , Baja California, 1820 m.

Seguenzia caliana Dall, 1919: 344  . Holotype USNM 207674View Materials. Off San Diego, California, 417 fms [= 762 m]. New synonym.

Seguenzia certoma Dall, 1919: 343  . Holotype USNM 211167. Off Point Loma, San Diego, California, 565–680 fms [= 1033– 1243 m]. New synonym.

Description. Shell to 8 mm, globular biconical; carinated spiral cords below suture, strongest one mid shoulder, approximately 8–15 from periphery to umbilicus, count increasing with size; intercalated spiral lines at best faint; axial cordlets distinct. Umbilicus very narrow in small specimens, closed by callus in larger shells. Columellar wall thickened, terminating in sharp spur. Flaring of lip variable depending on size, preservation of specimen.

Distribution. Aleutian Islands, Alaska (175°E) to Peru (3° S). 750–5100 m.

Remarks. Smaller specimens have proportionally more pronounced spiral and axial sculpture. The types of the three nominate taxa represent growth stages of the same species.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Family

Seguenziidae

Genus

Seguenzia

Loc

Seguenzia stephanica Dall, 1908

Geiger, Daniel L. 2019
2019
Loc

Seguenzia caliana

Dall, W. H. 1919: 344
1919
Loc

Seguenzia certoma

Dall, W. H. 1919: 343
1919
Loc

Seguenzia stephanica

Dall, W. H. 1908: 325
1908